Auger head



April 20, 1926.

J. UNDERATlON I AUGER HEAD Filed August 1'7 1925 4 =70) Ulla/dim Patented Apr. 1926.

, UNITED STATES PATENT OFFICE.

JOHN nnnnnn'rrou, or ALBIA, IOWA.

' AUG-ER HEAD.

Application filed August 17, 1925. Serial No. 50,752.

To all whom it may concern:

Be it known that I, J OHN UNnnaA'rroN, a citizen of the United ,States, residing at Albia, in thecounty of Monroe, State of Iowa, have invented certain new and useful Improvements in Auger Heads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in angers, and particularly to coal angers.

One object of the invention is to provide an auger wherein the cut-ting elements or bitsare readily removable for the purpose of substitution, when broken, or for the use of a larger or smaller number of bits.

Another object is to provide a novel and improved holder for the difierent bits, wherein the holder and bits cooperate with the walls of the socket of the auger to be firmly held therein.

Another object is to provide a device of this character whereby the practice of rendering the auger idle, while the bits are being sharpened, is obviated, as the operator carries a supply of bits, which can be quickly substituted for a dull or broken bit.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is an elevation of a portion of an auger, showing the use of single bit blades.

Figure 2 is an enlarged sectional detail view on the line 2-'2 of Figure 1.

Fi re 3 is a perspective view of a modified orm of holder, showing the use of two bit blades.

Figure 4 is a perspective yiew showing the use of three bits.

Figure 5 is a perspective view of the single bit blade and its holder.

Referring particularly to the accompanying drawing, .10 represents the shank of the auger, which has the spiralcoal dust conveying ribs 11. The lower end of each of the ribs 11 is enlarged outwardly of the shank of the auger, as shown at 12, and formed in each enlargement is'a tapered socket 13, the

inner end of which is open, as at 14, for a Upon referenceto Figure 5, it will be seen havin the converging sides 16, and With'the opposlte ends rounded, in conformity with the bottom of the socket and the outer end thereof. On the smaller end of the plate there is formed an angularly extending flange 17, against-which the narrower end of the bit blade 18 is arranged to engage, and which causes said blade to be driven out of the socket, when a suitable tool is inserted in said opening 14, and given a prying action against the smaller end of the plate. The outer end of the bit blade 18 is of greater width than the inner end, and is formed with a cutting edge 19. The inner and outer Wider walls of the socket taper slightly in a direction inwardly, whereby such walls may have a wedging action on the unfianged face of the plate 15, and on the outer face of the ortion of the blade which rests on said p ate, as clearly seen in Figure 2.

When two bit blades are used in each socket, the plate is modified, as shown in Figure 3,wherein the plate 20 not onl has the flange 21, on its smaller end, but as a longitudinal central flange or rib 22, on its upper face, which separates the two bit blades 23. This central rib is wider at its outer end than at its inner end whereby to dispose the bit blades in outward divergent "relation to each other.

25, whereby to provide for the outwardl diverging relation of the b't blades to eac other.

It will be understood that as the number of blades is increased, the number of spacing ribs is also increased.

In each instance the wedging action takes place between the wider walls of the socket and the exposed faces of the bit blades and unflanged face of the holder plate.

Furthermore, it will be particularly noted that the use of screws, bolts, or other like fastening means, is completely obviated, with the result that no projecting parts are present to interfere with the proper operation of the auger,'or to be broken off, and render the replacement of the bit blades diflicult.

What is claimed is:

1. An' auger including a shank havin sockets in one end, the wider walls of sai 24 is provided with the two tapering ribs sockets convergin inwardly, a plate removably seated in t e socket and having a flange, and a bit blade having its shank seated on the plate and engaged against said flange, the exposed wider faces of the plate andbit blade wedgingly cooperating with the said wider walls of the socket.

2. An auger including a shank having a socket in one end, a plate seated in the socket and having a flange on its inner end and a longitudinal rib extending from said flange, and bit blades on the plate at opposite sides of the rib, the exposed faces of the bit blades and the unflanged wider face of the plate wedgingly engaging the said wider Walls of the socket.

3. An auger including a shank having an obliquely extending socket in one end the wider walls of which converge inwardly, the

inner end wall of the socket having an opening for the introduction of a blade removing tool, a plate seated in the socket and having an angularly extending flange on th inner end of one of its Wider faces and a longitudinal central rib extending from said flange and being wider at its outer end, and bit blades seated on the flanged face of the plate at opposite sides of the rib and being held in outward diverging relation to each other by said rib, the exposed faces of the bit blades and the unfianged wider face of the plate being wedgingly engaged with the converging walls of the socket, whereby to frictionally hold the plate and blades therein. In testimony whereof, I aflix my signature.

JOHN UNDERATION. 

